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 The nsITransactionListener interface.
 <P>
 This interface is implemented by an object that tracks transactions.
[scriptable, uuid(58e330c4-7b48-11d2-98b9-00805f297d89)]
interface nsITransactionListener : nsISupports

Methods

 Called after a transaction manager begins a batch.
 @param aManager the transaction manager that began a batch.
 @param aResult the nsresult returned after beginning a batch.
void didBeginBatch(in nsITransactionManager aManager, in nsresult aResult) 
 Called after a transaction manager calls the doTransaction() method of
 a transaction.
 @param aManager the transaction manager that did the transaction.
 @param aTransaction the transaction that was executed.
 @param aDoResult the nsresult returned after executing
 the transaction.
void didDo(in nsITransactionManager aManager, in nsITransaction aTransaction, in nsresult aDoResult) 
 Called after a transaction manager ends a batch.
 @param aManager the transaction manager ending a batch.
 @param aResult the nsresult returned after ending a batch.
void didEndBatch(in nsITransactionManager aManager, in nsresult aResult) 
 Called after a transaction manager tries to merge
 a transaction, that was just executed, with the
 transaction at the top of the undo stack.
 @param aManager the transaction manager ending a batch.
 @param aTopTransaction the transaction at the top of the undo stack.
 @param aTransactionToMerge the transaction to merge.
 @param aDidMerge true if transaction was merged, else false.
 @param aMergeResult the nsresult returned after the merge attempt.
 @param aInterrupt listeners should set this to PR_TRUE if they
 want to interrupt normal control flow, without throwing an error.
void didMerge(in nsITransactionManager aManager, in nsITransaction aTopTransaction, in nsITransaction aTransactionToMerge, in boolean aDidMerge, in nsresult aMergeResult) 
 Called after a transaction manager calls the Redo() method of
 a transaction.
 @param aManager the transaction manager redoing the transaction.
 @param aTransaction the transaction being redone.
 @param aRedoResult the nsresult returned after redoing the transaction.
void didRedo(in nsITransactionManager aManager, in nsITransaction aTransaction, in nsresult aRedoResult) 
 Called after a transaction manager calls the Undo() method of
 a transaction.
 @param aManager the transaction manager undoing the transaction.
 @param aTransaction the transaction being undone.
 @param aUndoResult the nsresult returned after undoing the transaction.
void didUndo(in nsITransactionManager aManager, in nsITransaction aTransaction, in nsresult aUndoResult) 
 Called before a transaction manager begins a batch.
 @param aManager the transaction manager beginning a batch.
 @result boolean value returned by listener which indicates
 it's desire to interrupt normal control flow. Listeners should
 return true if they want to interrupt normal control flow, without
 throwing an error. Note that listeners can also interrupt normal
 control flow by throwing an nsresult that indicates an error.
boolean willBeginBatch(in nsITransactionManager aManager) 
 Called before a transaction manager calls a transaction's
 doTransaction() method.
 @param aManager the transaction manager doing the transaction.
 @param aTransaction the transaction being executed.
 @result boolean value returned by listener which indicates
 it's desire to interrupt normal control flow. Listeners should
 return true if they want to interrupt normal control flow, without
 throwing an error.
boolean willDo(in nsITransactionManager aManager, in nsITransaction aTransaction) 
 Called before a transaction manager ends a batch.
 @param aManager the transaction manager ending a batch.
 @result boolean value returned by listener which indicates
 it's desire to interrupt normal control flow. Listeners should
 return true if they want to interrupt normal control flow, without
 throwing an error. Note that listeners can also interrupt normal
 control flow by throwing an nsresult that indicates an error.
boolean willEndBatch(in nsITransactionManager aManager) 
 Called before a transaction manager tries to merge
 a transaction, that was just executed, with the
 transaction at the top of the undo stack.
 @param aManager the transaction manager ending a batch.
 @param aTopTransaction the transaction at the top of the undo stack.
 @param aTransactionToMerge the transaction to merge.
 @result boolean value returned by listener which indicates
 it's desire to interrupt normal control flow. Listeners should
 return true if they want to interrupt normal control flow, without
 throwing an error. Note that listeners can also interrupt normal
 control flow by throwing an nsresult that indicates an error.
boolean willMerge(in nsITransactionManager aManager, in nsITransaction aTopTransaction, in nsITransaction aTransactionToMerge) 
 Called before a transaction manager calls the Redo() method of
 a transaction.
 @param aManager the transaction manager redoing the transaction.
 @param aTransaction the transaction being redone.
 @result boolean value returned by listener which indicates
 it's desire to interrupt normal control flow. Listeners should
 return true if they want to interrupt normal control flow, without
 throwing an error. Note that listeners can also interrupt normal
 control flow by throwing an nsresult that indicates an error.
boolean willRedo(in nsITransactionManager aManager, in nsITransaction aTransaction) 
 Called before a transaction manager calls the Undo() method of
 a transaction.
 @param aManager the transaction manager undoing the transaction.
 @param aTransaction the transaction being undone.
 @result boolean value returned by listener which indicates
 it's desire to interrupt normal control flow. Listeners should
 return true if they want to interrupt normal control flow, without
 throwing an error. Note that listeners can also interrupt normal
 control flow by throwing an nsresult that indicates an error.
boolean willUndo(in nsITransactionManager aManager, in nsITransaction aTransaction)